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Secondary lung cancers, coloured X-ray. Metastases (secondary cancers, pink) have spread throughout the lungs of the patient. They have spread from a primary site of cancer in the lungs. Once a cancer has spread and invaded large areas of the body, it is invariably fatal. Radiotherapy and anti-cancer drugs can slow the progress of the cancer, and can help extend the patient's life. Painkilling drugs and medical nursing can improve the quality of the patient's life.